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Thread: 100 yard sights

  1. #1
    Join Date
    May 2004
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    100 yard sights

    I remember seeing on the bulletin board several years ago a formula for determining how far to raise your rear sight at 100 yards on a musket sighted for 50 yards. I wish I had printed it off then! Does anyone know what I'm referring to? I ask because someone gave me a trick to use for raising the rear sight if you don't need to go up a whole step on your factory sight. They suggested using a set of spark plug gap measurement tools as shims. So I got a set that came on a keychain so I could remove them individually. Problem is, I don't know which thickness to use. Then I remembered reading about that formula from way back.

    Sooooo... if I'm sighted in at a dead center hold at 50 yards, and I shoot 40 grains of 3F with a Rapine ashcan sized to .576, and wind and light and all other variables being equal, and Train A leaves Chicago traveling 48 miles per hour, how far do I need to raise my rear sight (in thousandths of an inch) for a dead center hold at 100 yards?????

    Thanks in advance...
    Jonathan Wolf
    Competitor # 10797V
    R. Preston Chew's Battery, ANV

  2. #2
    Join Date
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    Re: 100 yard sights

    Got my answer via PM. That was fast! Thanks!!
    Jonathan Wolf
    Competitor # 10797V
    R. Preston Chew's Battery, ANV

  3. #3
    Join Date
    May 2004
    Location
    Dayton, Ohio
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    Re: 100 yard sights

    Jonathan,

    You might want to re-think the ashcan at 100 yd. I tried EVERYTHING and never could get any accuracy due to the wreched ballistic coeficient. Finally had to go to a 510gr big minnie, Rapine 575510. Way big improvement!
    Greg Ogdan, 11444
    110th OVI

  4. #4
    Join Date
    Sep 2008
    Location
    Woodbridge, VA
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    Region:
    Potomac - Virginia, Maryland and Delaware

    Re: 100 yard sights

    Quote Originally Posted by jonniereb
    Got my answer via PM. That was fast! Thanks!!
    Please share "secret" formula with us all.
    Scott Kurki
    The Dulany Troop, 6th Virginia Cavalry

  5. #5
    Tom Magno, 9269V's Avatar
    Tom Magno, 9269V is offline
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    29th Wisconsin Volunteer Infantry
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    9269V
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    Western - Illinois and Wisconsin

    Re: 100 yard sights

    Train A leaves Chicago traveling 48 miles per hour.

    That's a mile traveled for every 1 minute 15 seconds. No secret, just math.

    Seriously, the formula is well known: sight radius/range = amount of change to move bullet strike 1", where range = 1800 for 50 yards, and 3600 for 100 yards.
    Tom Magno, 9269V
    29th Wisconsin Volunteer Infantry

  6. #6
    Join Date
    May 2004
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    Region:
    Middle Atlantic - New York, Pennsylvania and New Jersey

    Re: 100 yard sights

    Re: windage
    by Kurt Lacko 7862 ยป Sat Jul 09, 2011 2:09 pm

    Go to www.sdmfabricating.com and click on "sight correction calculator". I can't take credit for this one, info was provided by our adj. Tom.Kurt Lacko 7862

    Posts: 137
    Joined: Fri May 14, 2004 7:13 am

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